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Questions and Answers
Which of the following is NOT a characteristic of a chemical reaction?
Which of the following is NOT a characteristic of a chemical reaction?
- Change in temperature
- Release of energy (correct)
- Change in color
- Formation of new substances
Which of the following is an example of a chemical reaction?
Which of the following is an example of a chemical reaction?
- Melting of ice
- Burning of wood (correct)
- Mixing of salt and water
- Boiling of water
What is the difference between a chemical reaction and a physical change?
What is the difference between a chemical reaction and a physical change?
- Chemical reactions involve a change in energy, while physical changes involve the formation of new substances.
- Chemical reactions involve a change in state, while physical changes involve the formation of new substances.
- Chemical reactions involve a change in composition, while physical changes involve a change in state. (correct)
- Chemical reactions involve a change in composition, while physical changes involve a change in energy.
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Study Notes
Chemical Reactions
- A characteristic of a chemical reaction is a change in the chemical composition of the substances involved, resulting in new substances with new properties.
- A characteristic of a chemical reaction is the absorption or release of energy, often in the form of heat or light.
- A characteristic of a chemical reaction is the formation of new bonds between atoms or molecules.
Non-Characteristics of Chemical Reactions
- A change in state (e.g., solid to liquid or liquid to gas) is not a characteristic of a chemical reaction, but rather a physical change.
Examples of Chemical Reactions
- Rusting of iron is an example of a chemical reaction, where iron reacts with oxygen to form iron oxide.
- Combustion reactions, such as burning gasoline in a car engine, are examples of chemical reactions.
Chemical Reactions vs. Physical Changes
- A chemical reaction involves a change in the chemical composition of the substances involved, whereas a physical change involves a change in the state of a substance, but not its chemical composition.
- Examples of physical changes include melting, freezing, condensation, and evaporation.
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